I will answer in English, since i can't speak your language
I will suggest a way to punish these players without even the use of this technique:
Try to make the leeches known to the community.
If you see a player that is AFK every time in a battleground just make it known to their guild.
Trust me noone wants a leech in their guild. There is an amount of pride in the community of a guild,
whether the guild is big or small.
They will either stop this or get kicked.
---- Very important note: ----
We should not punish the people that don't have gear and need to go to battlegrounds or
don't know how to play goblinball but try to learn.
But if you see the same person go to battlegrounds and have exactly 0 total damage at the end of battle,
(this is only possible if you don't make a single attack) consider making them known if you see this repeating.
It works